This rollout is available from the Display panel. The buttons let you hide or unhide individual objects by selecting them, regardless of their category.
Hide Selected: Hides the selected object(s).
Hide Unselected: Hides all visible objects except the selected ones. Use this to hide all objects except the one you're working on. Objects hidden by category are not affected.
Hide By Name: Lets you select the objects to hide by name.
Hide By Hit: Causes any object you click in the viewport to be hidden. If you hold the CTRL key while selecting an object, that object and all of its children are hidden. To exit Hide by Hit mode, right-click, press Escape, or select a different function. This mode is automatically turned off if you hide all objects in the scene.
Unhide All: Unhides all hidden objects. The unhide buttons are available only when you have specifically hidden one or more objects. They won't unhide objects hidden by category.
Unhide By Name: Displays a dialog in which you can unhide objects you select from a list.